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Phytoplankton sterol contents vary with temperature, phosphorus and silicate supply : a study on three freshwater species

Phytoplankton sterol contents vary with temperature, phosphorus and silicate supply : a study on three freshwater species

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PIEPHO, Maike, Dominik MARTIN-CREUZBURG, Alexander WACKER, 2012. Phytoplankton sterol contents vary with temperature, phosphorus and silicate supply : a study on three freshwater species. In: European Journal of Phycology. 47(2), pp. 138-145. ISSN 0967-0262. eISSN 1469-4433

@article{Piepho2012Phyto-21518, title={Phytoplankton sterol contents vary with temperature, phosphorus and silicate supply : a study on three freshwater species}, year={2012}, doi={10.1080/09670262.2012.665484}, number={2}, volume={47}, issn={0967-0262}, journal={European Journal of Phycology}, pages={138--145}, author={Piepho, Maike and Martin-Creuzburg, Dominik and Wacker, Alexander} }

Martin-Creuzburg, Dominik deposit-license 2013-04-30T22:25:06Z European Journal of Phycology ; 47 (2012), 2. - S. 138-145 2013-02-27T09:55:09Z Piepho, Maike Wacker, Alexander eng Wacker, Alexander Piepho, Maike Martin-Creuzburg, Dominik The understanding of environmentally induced changes in the biochemical composition of phytoplankton species is of great importance in both physiological studies and ecological food web research. In extensive laboratory experiments we tested the influence of two different temperatures (10 C and 25 C) and a phosphorus supply gradient on the sterol concentrations of the three freshwater phytoplankton species Scenedesmus quadricauda, Cryptomonas ovata and Cyclotella meneghiniana.<br />The diatom C. meneghiniana was additionally exposed to a silicate gradient. In two separate experiments we analysed (1) possible interactive effects of temperature and phosphorus supply and (2) the effect of four phosphorus levels and three silicate levels on algal sterol concentrations. We observed that sterol concentrations were higher at 25 C than at 10 C in S. quadricauda and C. meneghiniana, but were not affected by temperature in C. ovata. Interactive effects of temperature and phosphorus supply on sterol concentrations were found in C. meneghiniana. This presumably was due to the bioconversion of<br />one sterol (24-methylenecholesterol) into another (22-dihydrobrassicasterol). Increasing phosphorus supply resulted in species-specific effects on sterol concentrations, viz. an optimum curve response in S. quadricauda, a saturation curve response in C. meneghiniana and no change in sterol concentration in C. ovata. Effects of silicate supply on the sterols of C. meneghiniana equalled the effects of phosphorus supply. Albeit we did not observe a general trend in the three phytoplankton species tested, we conclude that sterol concentrations of phytoplankton are strongly affected by temperature and nutrient supply. Interactive effects point out the importance of taking into account more than just one environmental factor<br />when assessing the effects of environmentally induced changes on phytoplankton sterol concentrations. 2012 Phytoplankton sterol contents vary with temperature, phosphorus and silicate supply : a study on three freshwater species

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